Begat from the work in bug 1193951 / https://github.com/mozilla/treeherder/pull/933 which improved the layout of the Sheriff panel, we discussed the idea of adding an fa-pencil on hover to the right side of any editable value. For example, the Exclusion profile names, and the Job exclusion names.
This will further cue the user they are an editable values, rather than just being an underlined link with a tooltip.
This bug represents that work.

Comment on attachment 8750054[details][review]
[treeherder] KWierso:bug1201982 > mozilla:master
And another.
I also included a change to make some of the surrounding CSS use four-space indents like the rest of the file. Happy to drop those if you don't want them as part of this. :)